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for the surface f(x/y/z)=x3+3x2y2+y3+4xy-z2=0 find any vector that is normal to the surface at the point...

for the surface f(x/y/z)=x3+3x2y2+y3+4xy-z2=0 find any vector that is normal to the surface at the point Q(1,1,3). use this to find the equation of the tangent plane to the surface at q.

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